公开(公告)号：US10439936B2

公开(公告)日：2019-10-08

申请号：US15969326

申请日：2018-05-02

Applicant: Metaswitch Networks Ltd

Inventor： Simon Wingrove ,  Michael Curtis ,  Shaun Crampton ,  Alex Pollitt

IPC: H04L12/741 ,  H04L12/715

Abstract: Measures, including methods, systems, non-transitory computer-readable storage mediums and computer programs for use in routing packet data. At a network switching device, a data packet is received from a device located upstream of the network switching device. The received data packet comprises routing data associated with a routing decision which has been taken for the data packet upstream of the network switching device. The routing data comprises an abstract media access control (MAC) address corresponding to a next hop destination for the data packet located downstream of the network switching device. At the network switching device, the abstract MAC address in the data packet is replaced with a real MAC address of the next hop downstream destination. At the network switching device, the data packet is forwarded towards the next hop downstream destination.

公开(公告)号：US10063456B2

公开(公告)日：2018-08-28

申请号：US14262609

申请日：2014-04-25

Applicant: Metaswitch Networks Ltd

Inventor： Casey Davenport ,  Simon Wingrove ,  Alex Pollitt ,  Michael Curtis ,  Shaun Crampton ,  Steve Balls ,  Fiona Corden

IPC: H04L12/751 ,  H04L12/715

CPC classification number: H04L45/02 ,  H04L45/64

Abstract: Measures for processing data in a packet-switched network. A first device is configured to snoop control packets of a predetermined control plane protocol in the network. The predetermined control plane protocol is operated by a plurality of other devices in the network to obtain Layer 2 information on the basis of known Layer 3 information. The first device does not operate the predetermined control plane protocol in the network. At the first device, in response to identifying that a given snooped packet was generated according to the predetermined control plane protocol. Layer 3 information associated with a second device in the plurality is extracted from the given snooped control plane protocol packet on the basis of known Layer 2 information associated with the second device. The second device is connected to the first device.

公开(公告)号：US20180359182A1

公开(公告)日：2018-12-13

申请号：US15969326

申请日：2018-05-02

Applicant: Metaswitch Networks Ltd

Inventor： Simon Wingrove ,  Michael Curtis ,  Shaun Crampton ,  Alex Pollitt

IPC: H04L12/741

CPC classification number: H04L45/74 ,  H04L45/64

Abstract: Measures, including methods, systems, non-transitory computer-readable storage mediums and computer programs for use in routing packet data. At a network switching device, a data packet is received from a device located upstream of the network switching device. The received data packet comprises routing data associated with a routing decision which has been taken for the data packet upstream of the network switching device. The routing data comprises an abstract media access control (MAC) address corresponding to a next hop destination for the data packet located downstream of the network switching device. At the network switching device, the abstract MAC address in the data packet is replaced with a real MAC address of the next hop downstream destination. At the network switching device, the data packet is forwarded towards the next hop downstream destination.

公开(公告)号：US10003474B2

公开(公告)日：2018-06-19

申请号：US14267813

申请日：2014-05-01

Applicant: Metaswitch Networks Ltd

Inventor： Robert Brockbank ,  Alex Pollitt ,  Michael Curtis ,  Shaun Crampton

IPC: H04L12/851 ,  H04L12/64 ,  H04L12/721 ,  H04L12/24

CPC classification number: H04L12/6418 ,  H04L41/0672 ,  H04L41/5096 ,  H04L45/38 ,  H04L47/2483

Abstract: A controller node receives a list of a first plurality of flows programmed on a network switch. The controller node extracts a flow cookie value from a flow cookie data field of each flow in the first plurality of flows on the received list and calculates a session identifier on the basis of the extracted cookie values. At least one add flow command is transmitted from the controller node to the network switch to program a second plurality of flows on the network switch. The at least one add flow command comprises flow cookie values in the flow cookie data fields of each of the flows in the second plurality of flows which are set equal to the calculated session identifier. At least one delete flow command is transmitted from the controller node to the network switch to delete programming of the first plurality of flows on the network switch.

公开(公告)号：US09923799B2

公开(公告)日：2018-03-20

申请号：US14262631

申请日：2014-04-25

Applicant: Metaswitch Networks Ltd

Inventor： Casey Davenport ,  Simon Wingrove ,  Alex Pollitt ,  Michael Curtis ,  Shaun Crampton ,  Steve Balls ,  Fiona Corden

IPC: H04L12/751 ,  H04L12/717 ,  H04L12/741

CPC classification number: H04L45/02 ,  H04L45/42 ,  H04L45/74

Abstract: Measures for processing data in a packet-switched network. At a first device in the network, a packet transmitted from a second device in the network is received. The received packet comprising an Internet Protocol (IP) address for a third device in the network. On the basis of the IP address for the third device comprised in the received data packet, lookup in an IP routing table of the second device is initiated to obtain a next-hop address for the received packet. The obtained next-hop IP address is determined to be an IP address of a device connected to the first device.

公开(公告)号：US10999101B2

公开(公告)日：2021-05-04

申请号：US15970827

申请日：2018-05-03

Applicant: Metaswitch Networks Ltd

Inventor： Robert Brockbank ,  Alex Pollitt ,  Michael Curtis ,  Shaun Crampton

IPC: H04L12/64 ,  H04L12/851 ,  H04L12/721 ,  H04L12/24

Abstract: A controller node receives a list of a first plurality of flows programmed on a network switch. The controller node extracts a flow cookie value from a flow cookie data field of each flow in the first plurality of flows on the received list and calculates a session identifier on the basis of the extracted cookie values. At least one add flow command is transmitted from the controller node to the network switch to program a second plurality of flows on the network switch. The at least one add flow command comprises flow cookie values in the flow cookie data fields of each of the flows in the second plurality of flows which are set equal to the calculated session identifier. At least one delete flow command is transmitted from the controller node to the network switch to delete programming of the first plurality of flows on the network switch.

公开(公告)号：US09985882B2

公开(公告)日：2018-05-29

申请号：US14527575

申请日：2014-10-29

Applicant: Metaswitch Networks Ltd

Inventor： Simon Wingrove ,  Michael Curtis ,  Shaun Crampton ,  Alex Pollitt

IPC: H04L12/741 ,  H04L12/715

CPC classification number: H04L45/74 ,  H04L45/64

Abstract: Measures, including methods, systems, non-transitory computer-readable storage mediums and computer programs for use in routing packet data. At a network switching device, a data packet is received from a device located upstream of the network switching device. The received data packet comprises routing data associated with a routing decision which has been taken for the data packet upstream of the network switching device. The routing data comprises an abstract media access control (MAC) address corresponding to a next hop destination for the data packet located downstream of the network switching device. At the network switching device, the abstract MAC address in the data packet is replaced with a real MAC address of the next hop downstream destination. At the network switching device, the data packet is forwarded towards the next hop downstream destination.

公开(公告)号：US09871717B2

公开(公告)日：2018-01-16

申请号：US14262639

申请日：2014-04-25

Applicant: Metaswitch Networks Ltd

Inventor： Casey Davenport ,  Simon Wingrove ,  Alex Pollitt ,  Michael Curtis ,  Shaun Crampton ,  Steve Balls ,  Fiona Corden

IPC: H04L12/751 ,  H04L12/721 ,  H04L12/715

CPC classification number: H04L45/02 ,  H04L45/26 ,  H04L45/64

Abstract: Measures for processing data in a packet-switched network. At a first device in the network, an echo request packet is transmitted into the network. The echo request packet comprises a predetermined identifier. An echo response packet is received from a second device in the network. In response to the received echo response packet comprising the predetermined identifier, the received echo response packet is identified as a packet generated on the basis of an echo request packet originated from the first device, and an Internet Protocol (IP) address comprised in the received echo response packet is determined to be an IP address of the second device.

公开(公告)号：US09742660B2

公开(公告)日：2017-08-22

申请号：US14608078

申请日：2015-01-28

Applicant: Metaswitch Networks Ltd

Inventor： Christopher Liljenstolpe ,  Simon Wingrove ,  Michael Curtis ,  Tom Denham ,  Paul Tiplady ,  Alex Pollitt

IPC: G06F15/16 ,  H04L12/721 ,  H04L12/24

CPC classification number: H04L45/14 ,  H04L41/0866 ,  H04L41/0893 ,  H04L45/56

Abstract: Certain examples described herein provide a system and method for validating a routing function for a network device. In one example, a network device has a run-time policy engine, wherein the run-time policy engine implements a routing configuration file and the routing configuration file defines a routing function for network traffic. A file editor is also provided that loads the routing configuration file. The file editor has an editor policy engine that duplicates a functionality of the run-time policy engine. In one example, the routing configuration file has at least one validation portion that has one or more route statements with definitions indicative of expected routing function behavior. The file editor parses the routing configuration file by implementing the routing configuration file using the editor policy engine. The editor policy engine applies the routing function defined by the routing configuration file to the one or more route statements and indicates where a result of the routing function does not conform to the definitions indicative of expected routing function behavior. These examples may help to reduce routing errors due to configuration errors in network devices.

公开(公告)号：US10165090B2

公开(公告)日：2018-12-25

申请号：US14473680

申请日：2014-08-29

Applicant: Metaswitch Networks Ltd

Inventor： Fiona Corden ,  Steve Balls ,  Alex Pollitt ,  Shaun Crampton ,  Jonathan Harrison ,  Jeff Rollins

IPC: H04L29/06 ,  H04L12/715 ,  H04L12/713 ,  H04L29/08

Abstract: Measures for transferring routing protocol information between a software defined network and one or more external networks are provided. A control node in a software defined network (SDN) is configured to maintain a protocol information database comprising routing protocol information for one or more switching nodes in the SDN. In response to detecting occurrence of a predetermined trigger event, the control node modifies the routing protocol information in the protocol information database, and determines whether the one or more switching nodes include an edge switching node. In response to the determination, a routing protocol message is transmitted from the control node to the edge switching node for forwarding via an external network interface. The routing protocol message includes data generated on the basis of the modified routing protocol information.